GREY GUM AND ITS ESSENTIAL OIL. 267 
yield 885 per cent., or 100 Ibs. of leaves and branchlets gave 144 
ounces of oil; specific gravity as obtained ‘9205 @ 17° C.; specific 
rotation [a], — 0-92. 
On redistillation of 100 cc. a few drops only below 167°3° C. 
[See table. ] 
Second fraction, specific gravity *9185; specific rotation - ‘92. 
Eucalyptol in the crude oil =51°6 per cent. 
om » second fraction = 67°2 per cent. 
Leaves were from a large tree. Although the specific gravity 
is high, the oil is not so good as those that are less dark, and 
dextro-rotatory. 
5, Oil from leaves collected near Canterbury, 12th May, 1897. 
Distilled 13th May. 
Oil rather dark in colour, odour pleasant ; yield ‘75 per cent., 
or 100 ibs. of leaves and branchlets gave 12 ounces of oil ; specific 
gravity as obtained -9129 @ 17° C.; specific rotation [a], + 1°37. 
On redistillation of 100 cc. more drops came over below 167°3°C. 
than usual. ([See table.] 
Second fraction, specific gravity ‘913; specific rotation + 1:26. 
Eucalyptol in the crude oil = 48-9 per cent. 
” »» second fraction = 52-9 per cent. 
These were mixed leaves from old trees. Most of the terpenes 
remain in the large fraction, thus reducing the value of that portion. 
6. Oil from leaves collected near Canterbury, 13th May, 1897. 
Distilled 14th May. 
Oil but slightly coloured ; odour very pleasant ; yield ‘844 per 
cent. or 100 tbs. of leaves and branchlets gave 134 ounces of oil; 
Specific gravity as obtained ‘9164; specific rotation [a], + 0°54, 
On redistillation of 100 cc. only two or three drops came over 
below 164:2°C., at 1663 commences to come over somewhat 
rapidly. [See table. ] 
Second fraction, specific gravity ‘9183; specific rotation + 1-09. 
